Fungal Symbiosis and Root Colonization
Vesicular Arbuscular Mycorrhiza (VAM) belongs to the phylum Glomeromycota, with *Glomus intraradices* and *Glomus mosseae* being the most widely formulated commercial species.
Upon root contact, fungal spores germinate and penetrate cortical cells, producing arbuscules for nutrient exchange and extensive external hyphal networks that forage through soil pores far beyond the physical reach of plant root hairs.
- Organism type: Symbiotic endomycorrhizal fungi (*Glomus* species)
- Structure: Microscopic internal arbuscules and extensive external hyphal networks
- Regulatory framework: Certified bio-fertilizer under Schedule III of the Fertilizer (Control) Order (FCO)
- Root expansion: Expands effective root absorptive surface area by 100 to 1,000 percent
Phosphorus Solubilization and Agronomic Benefits
Phosphorus is largely immobile in soil and easily locked into insoluble iron, aluminum, or calcium complexes. Mycorrhizal hyphae secrete phosphatase enzymes and organic acids that solubilize fixed phosphorus.
In addition to phosphorus, mycorrhizal networks absorb immobile trace micronutrients (especially Zinc, Copper, and Iron), improve water uptake during dry spells, and create physical root barriers against parasitic nematodes.
- Phosphorus uptake: Solubilizes and transports immobile orthophosphate ions directly into root cortical cells
- Micronutrient mobilization: Enhances biological absorption of trace Zinc, Copper, and Manganese
- Drought tolerance: External hyphae access moisture from microscopic soil micropores during moisture stress
- Root protection: Shields feeder roots against soil-borne root-rot fungi and plant-parasitic nematodes
Application Methods, Formats, and Soil Compatibility
Commercial mycorrhizal formulations are available as coated granules for soil broadcasting, fine wettable powders for seed dressing, and concentrated liquids for drip fertigation.
Apply mycorrhiza during sowing or early vegetative stages close to active root zones. Avoid applying chemical fungicides to the soil immediately before or after application to ensure fungal spore survival.
- Granular application: Broadcast 4 to 8 kg per acre mixed with organic compost during basal fertilization
- Drip fertigation: Apply liquid mycorrhizal formulations through micro-irrigation filters
- Fungicide caution: Avoid applying chemical soil fungicides within 10 to 14 days of mycorrhiza inoculation
- Soil organic matter: Thrives in soils enriched with farmyard manure (FYM) or vermicompost
Official source
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Ministry of Agriculture and Farmers Welfare (Fertilizer Division) ↗Related on KisanPe
Common questions
How does Mycorrhiza improve phosphorus availability in Indian soils?
Mycorrhizal fungal hyphae secrete organic acids and phosphatases that dissolve fixed soil phosphorus, channeling it directly into plant roots via microscopic fungal filaments.
Can Mycorrhiza bio-fertilizer be used along with chemical NPK fertilizers?
Yes, it is compatible with moderate chemical fertilizer applications; however, avoid excessive concentrated chemical phosphorus at planting, as high soluble phosphate can temporarily suppress mycorrhizal colonization.
What crops benefit most from Mycorrhiza application?
Almost all agricultural crops—including sugarcane, cotton, maize, wheat, pulses, vegetables, and fruit orchards—form beneficial mycorrhizal associations, with the exception of brassicas (mustard, cabbage).
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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